Inelastic electron scattering on the N = 28 isotones 48Ca, 50Ti, and 54Fe and the shape and magnitude of the M1 strength distributions

Abstract Following the recent discovery of a very strong magnetic dipole transition in 48 Ca to a state at 10.23 MeV in high-resolution inelastic electron scattering, results of a detailed search for M1 strength in the other N = 28 Isotones 50 Ti, 52 Cr and 54 Fe are described. The M1 strength found in the investigated region of excitation energy E x ≈ 7–12 MeV is very fragmented and considerably quenched in comparison to predictions of shell model calculations in a model space that includes up to 2p-2h excitations.